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If the activation energy of a reaction is 80.9 kJ mol^–1

If the activation energy of a reaction is 80.9 kJ mol–1, the fraction of molecules at 700K, having enough energy to react to form products... View Article

In a mildly alkaline medium, thiosulphate ion is oxidized by to “A”. The oxidation state of sulphur in “A” is ________.

Answer: +6 S2O2-3 + MnO-4 Alkaline Medium →A A → SO2-4 Oxidation no. of 'S' = +6... View Article

A ball weighing 10g is moving with a velocity of 90ms^-1. If the uncertainty in its velocity is 5%, then the uncertainty in its position is ________×10^-33m.

[Given: h = 6.63×10-34 J s] Answer: 1 m = 10 g = 10-2 kg v = 90 m/s Δv = v × 5% = 90 × 5 / 100 = 4.5 m/s Δx ≥... View Article

E.m.f of the following cell at 298 K in V is x ×10^-2.

E.m.f of the following cell at 298 K in V is x ×10-2. Zn|Zn2+ (0.1 M)||Ag+(0.01 M)| Ag The value of x is _________. (Rounded off to the... View Article

Average S–F bond energy

The average S–F bond energy in kJ mol–1 of SF6 is __________. (Rounded off to the nearest integer) [Given: The values of standard... View Article

The number of stereoisomers possible for [Co(ox)₂(Br)(NH₃)]^2- is ____________. [ox = oxalate]

Answer: 3 [Co(Ox)2Br(NH3)]2- Total stereoisomer = 2 (OI) + 1 POE (pair of enantiomers) = 3... View Article

The NaNO₃ weighed out to make 50 mL of an aqueous solution containing 70.0 mg Na⁺ per mL is ________g.

(Rounded off to the nearest integer)[Given: Atomic weight in g mol–1. Na: 23; N: 14; O: 16. Answer: 13 Na+ = 70 mg/mL WNa in 50 mL solution... View Article

Seliwanoff test and Xanthoproteic test are used for the identification of and _ respectively

Seliwanoff test and Xanthoproteic test are used for the identification of __________ and ___________ respectively a. ketoses, proteins b.... View Article

Considering the given reaction, the major product among the following is:

Considering the given reaction, the major product among the following is: Answer: (c) Hence the answer is c... View Article

Choose the correct order of the basic nature of the below-given amines.

A. Phenyl methanamine B. N, N-Dimethylaniline C. N-Methyl aniline D. Benzenamine a. D > C > B > A b. D > B > C > A c. A > C... View Article

Which of the following forms of hydrogen emits low energy b^– particles?

a. Proton H+ b. Deuterium c. Protium d. Tritium Answer: (d) Tritium isotope of hydrogen is radioactive and emits low energy b–... View Article

Match List-I with List-II: Sodium Carbonate,Deacon

Match List-I with List-II List-I List-II a. Sodium Carbonate i. Deacon b. Titanium ii. Caster-Kellner c.... View Article

Identify A in the given reaction.

Answer: (b) Hence the answer is b... View Article

Match List-I with List-II: Siderite, Calamine, Malachite,Cryolite

Match List-I with List-II List-I List-II a. Siderite i. Cu b.Calamine ii. Ca c. Malachite iii. Fe d.... View Article

Identify A in the given chemical reaction- internal aldol condensation

Identify A in the given chemical reaction. Answer: (a) a.(Internal aldol condensation)... View Article

Thallium shows Tl⁺ state due to inert pair effect. The correct order of electron gain enthalpy is

a. S > Se > Te > O b. O > S > Se > Te c. S > O > Se > Te d. Te > Se > S > O Answer: (a) Electron gain... View Article

Ceric ammonium nitrate and CHCl₃/alc. KOH are used for the identification of functional groups present in _and respectively.

a. alcohol, amine b. amine, alcohol c. alcohol, phenol d. amine, phenol Answer: (a) Alcohol gives a positive test with ceric ammonium... View Article

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